how do i know if i need a restrictor in the oil feed? i have a t25 turbo the line is 3/8 diamater ss. the reason i ask this is because i just ran the car for the first time and i am getting blue smoke and oil in the turbo intake housing, like right where the air comes in please give me as much info as you can... also if i barely drove the car is the turbo already screwed or can it still be saved with a reducer?
If you have a BB turbo you likely need the restictor. go to garretts website "turbo optimization" page/link.
They advertise that you should only have about 40-45 psi at the turbo. you may want to put a gage inline (after the restricter) and before the turbo.
Also, be sure your drain correct: at least -10AN size with no bends. Orientation of the drain should be within a few degress of straight down since it's only drained by gravity.
You're drain back bung on the oil pan should not be below your oil level and not dead headed into the windage tray or any that causes restriction. If all that is good you may need some other advice.
thank you sir i just orderd a .06 restrictor after researching the needed amount for my nissan turbo
where do you get a restrictor?
horsepower is the force that determines at what speed you hit the wall, torque is the force that determines how far you take the wall with you after you hit it.
ATP turbo has inline restrictors - mcmaster.com also has npt/npt fittings with orifices. you basically want about 0.040" or 0.060" - hole for ball bearing turbos. At a particular pressure the orifice is calibrated to allow a certain flow. Ball bearings are much less suceptible to low flow, compared to journal bearing turbos, and I will keep recommending to reference garrett's website under "turbo optimization link" they are the experts.
